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Functions with parameters

This function contains a parameter.

  • function keyword to define a function
  • the name of the function in lowerCamelCase: getLower
  • (name): the parentheses containing the parameter name
  • the opening curly brace: {
  • the function body. In this example, return name.toLowerCase() returns a copy of the name in lowercase.
  • the closing curly brace: }
function getLower(name) {
    return name.toLowerCase()
}

Two or more parameters​

  • Parameters go inside the parentheses ().
  • When you have more than one parameter, you must separate them with a comma character.
function sum(a, b) {
    return a + b
}